Re: [PATCH 2.4.23-pre8] Remove broken prefetching in free_one_pgd()

From: Pavel Machek <pavel_at_ucw.cz>
Date: 2003-10-27 20:52:59
Hi!

>  > > This code will prefetch from beyond the end of the page table
>  > > being cleared ... which is clearly a bad thing if the page table
>  > > in question is allocated from the last page of memory (or precedes
>  > > a hole on a discontig mem system).
>  > Prefetching random addresses should be safe...
> 
> It isn't on some CPUs.  Early athlons go bang when you prefetch
> past the end of RAM into unmapped memory for eg.

Well, broken HW :-(, but andi's patch should fix up for that.

								Pavel

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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Received on Mon Oct 27 04:58:39 2003

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